How to Manage Pests

Pests in Gardens and Landscapes

Honeylocust pod gall midge—Dasineura gleditschiae

Honeylocust pod gall midge adults are tiny, delicate flies, often with long, slender antennae.

Damage

Feeding by larvae of the honeylocust pod gall midge causes honey locust leaflets to form galls, each containing one to several small, pinkish white maggots. Heavily infested foliage turns brown and drops prematurely, leaving parts of branches leafless. Galls are most apparent early in the growing season.

Solutions

Because the honeylocust pod gall midge has many generations annually and larvae are protected from sprays, this insect is not effectively controlled with insecticides. However, horticultural oils can be effective against eggs if applied early in the season shortly after the eggs are laid. In California eggs may be laid as early as mid-February. Apply when small red eggs are observed on new growth or when adult midges are seen swarming around the trees. Several applications may be needed. Established trees are rarely if ever killed, so damage, although unsightly, can be tolerated. Consider planting alternative species or varieties in landscapes where the plant aesthetic value is high.

Adult honeylocust pod all midge
Adult honeylocust pod gall midge
distorted terminals
Distorted terminals
Empty midge pupal cases
Empty midge pupal cases

Statewide IPM Program, Agriculture and Natural Resources, University of California
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Agriculture and Natural Resources, University of California

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